How To Determine Where To Mount Your Axles On A Trailer Build

Question

Question:

How do I calculate the 60 40 on a 14’ foot trailer for axle placement

asked by: Pedro M

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Expert Reply:

The 60/40 rule of thumb method would have the center of the axle spaced at 8.4' (14' x 60%) from the center of the coupler. For tandem axle trailers this is where the equalizer would sit. The key is going to be setting the axles so that the tongue weight sits at 10-15% of the total trailer weight. I've attached a help article below going over how where to place the axle and the formulas needed to determine where to move the axle(s) if the tongue weight falls above or below 10-15%.

expert reply by: Kevin C

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Answer 1

Determining the location of the axles on your triple axle trailer can be difficult, but basically you want to locate the axles so that the tongue weight of the trailer is 10 percent of the total trailer. I attached a picture that details the…

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Answer 2

Thank you for purchasing from etrailer! You did a great job selecting compatible parts. When using Leaf Springs #e64SR with the #AP233 Equalizer Kit and the #H248 Hanger Kit, there should be 29-1/2" between the front and center hangers and…

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Answer 3

In order to calculate where the axles would go on your trailer, there are several things that need to be taken into consideration. You will have to mock up the trailer with the suspension and axles to get the weights needed to determine where the…

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Answer 4

To determine spring hanger placement for proper axle positioning you want to use the trailer tongue weight (TW) as a guide. The coupler at the trailer tongue is used as the reference point for the axles' positions. The coupler to axle distance…

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Answer 5

There will be different dimensions between the hangers. From front to back your hangers for that 20-3/8 inch spring like #e84SR will be 24-3/4 on center then 29 inches on center and finally 24-3/4 inches on center. This will put each of the 3 axles…

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Answer 6

I can tell you how you can measure this, but unfortunately we don't have a database with that type of information on each specific trailer. Because of the varying weights on different trailers you can get different measurements between the axles…

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Answer 7

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 8

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 9

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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Answer 10

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 11

I have attached for you below some common torque values needed for a trailer suspension system but a lot of these will vary by bolt size and other factors. U-Bolts: Varies by Size - 1/2" bolts: 45 ft/lbs - 70 ft/lbs, 9/16" bolts: 65 ft/lbs…

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Answer 12

To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the…

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How To Determine Where To Mount Your Axles On A Trailer Build

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